Force between two identical charges placed at a distance of \( \mathrm{r} \) in vacuum is F. Now...

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Force between two identical charges placed at a distance of \( \mathrm{r} \) in vacuum is F. Now a slab of dielectric of dielectric contrant 4 is inserted between these two charges. If the thickness of the slab is \( r / 2 \), then the force between the charges will become
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